JPH09290993A - Hoisting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hoist a hoisting body with keeping appropriate posture while its inclination is controlled, and appropriately arrange the hoisting body to a hoisting equipment. SOLUTION: In a hoisting equipment, a driven part 23 to coil/uncoil a wire rope 25 to/from an equipment body 21 having a rope fixing part 24 is built in, one end of the rope 25 is fixed to a coiling drum 23b of the drive part 23, the other end of the rope 25 is fixed to the rope fixing part 24, the rope 25 is passed through two rotatable pulleys 31, 32 in a hoisting body 28 to support a luminaire (suspended article 27), the body 28 is suspended by the rope 25, and the body 28 is elevated/lowered by coiling/uncoiling the rope 25. A pulley base 29 is located at the center in the longitudinal direction of the body 28, and built therein in a see-saw motion around a supporting shaft 30. The pulleys 31, 32 are individually fitted to each end part in the longitudinal direction of the pulley base 29. Inclination of the body 28 associated with coiling/uncoiling of the rope 25 is controlled by the see-saw motion of the base 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supports suspended objects such as lighting equipment and audio equipment, and is installed on a high ceiling of a gymnasium, factory, arena, etc., and the suspended object is taken up by winding and unwinding a wire rope. The present invention relates to an elevating device for elevating and lowering.

[0002]

2. Description of the Related Art One of the electric lifting devices installed on the ceiling of a gymnasium or the like for lifting and lowering a lighting fixture includes a one-winding type. The schematic structure of this lifting device is shown in FIG. In FIG. 3, reference numeral 1 denotes an apparatus main body installed on the ceiling 2, and the main body 1 has a drive unit 3 and a rope fixing unit 4 built therein. The drive unit 3 is formed by connecting a winding drum 3b to an output shaft of a motor 3a with a speed reducer capable of rotating in the normal and reverse directions.
For b, a single drum type, that is, a winding drum having a single winding portion of the wire rope 5 is adopted. The rope fixing portion 4 is provided corresponding to the winding drum 3b.

One end of the wire rope 5 which is wound and unwound with respect to the winding drum 3b is connected to the winding drum 3b, and the other end is fixed to the rope fixing portion 4 via a rope stopper 6. There is. The rope 5 suspends an elevating body 8 which supports a lighting device 7. In this suspension, two pulleys 9 are rotatably built in the lifting body 8. By passing the wire ropes 5 through these pulleys 9 and passing the ropes 5 through the lifting body 8 in a U-turn shape. ,
The lifting body 8 is suspended on the wire rope 5. Both of the two pulleys 9 are provided immovably in the vertical direction with respect to the lifting body 8.

In the electric lift device having such a structure, the motor 3a with a speed reducer of the drive unit 3 is rotated in the forward direction to wind the wire rope 5 around the winding drum 3b, so that the lifting body 8 is raised together with the lighting fixture 7. The lighting fixture 7 can be lowered to the lowered position on the floor side together with the elevating body 8 by being able to raise it to the position and by reversing the motor 3a to rewind the wire rope 5 from the winding drum 3b.

At the raised position, the lifting guide 8 is positioned by the positioning guide 10 provided on the apparatus main body 1, and the load of the lighting fixture 7 is applied to the wire rope 5.
The lifting body 8 is mechanically supported by the apparatus main body 1 by a lock mechanism (not shown) for suppressing the addition of
The device main body 1 and the lifting body 8 are electrically connected to each other, and the lighting fixture 7 can be energized via the lifting body 8. At the lowered position, maintenance such as lamp replacement of the lighting fixture 7 is performed.

[0006]

In the one-winding type lifting device as described above, only one end of the wire rope 5 is wound and unwound, and the other end of the wire rope 5 is fixed to the rope fixing portion 4. Therefore, as the wire rope 5 is wound around the winding drum 3b, the elevating body 8 is inclined and raised so that the drive unit 3 side is raised, as shown in FIG. On the contrary, the winding drum 3b of the wire rope 5
Along with the rewinding from, the elevating body 8 is inclined and lowered so that the drive unit 3 side is lowered as shown in FIG. 4 (B).

Since the elevating body 8 is tilted in this way and the behavior during elevating is not stable, there is a problem that the elevating posture is not good, and in particular, the inclination of the elevating body 8 when ascending raises the positioning guide 10. This poses a problem that positioning is hindered, and there is a high possibility that the elevating body 8 cannot be properly arranged with respect to the apparatus main body 1 in the raised position.

[0008] Therefore, the problem to be solved by the present invention is to provide an elevating device capable of elevating and lowering an elevating body while maintaining a proper posture while suppressing its inclination, and properly disposing the elevating body with respect to the apparatus body. To get.

[0009]

According to the present invention, a drive unit for winding and unwinding a wire rope is built in a device body having a rope fixing portion and arranged at a high place, and this drive unit has One end of the wire rope is fixed to the winding drum, the other end of the wire rope is fixed to the rope fixing portion, and the wire rope is attached to two rotatable pulleys incorporated in an elevating body that supports suspended objects. It is premised on an elevating device in which the elevating body is suspended by this rope by passing in a U-turn shape via a wire, and the elevating body is raised and lowered by winding and unwinding the wire rope.

In order to solve the above-mentioned problems, the invention of claim 1 incorporates a pulley base in the elevating body, supports the center position in the longitudinal direction of the base by a support shaft, and supports the support shaft. It is characterized in that the pulley base is provided at the center so that the seesaw can move freely, and the pulleys are individually attached to both longitudinal ends of the pulley base.

In the invention of claim 1, the pulley base built in the lifting body is provided with seesaw motions centering on the support shaft, with the pulleys supported at both longitudinal ends thereof, respectively. When the wire rope that has passed through each pulley is wound up and the lifting body is raised, the pulley base moves up and down around the spindle so that the pulley on the drive side goes up and the pulley on the rope fixed side goes down. Tilts in the body,
On the contrary, when the wire rope is rewound to lower the lifting body, the pulley base tilts in the lifting body around the support shaft so that the pulley on the drive unit side moves down and the pulley on the rope fixing unit side moves up. . Such seesaw movement of the pulley base suppresses the tilting of the lifting body when the lifting body is raised and lowered by winding and unwinding the wire rope.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram conceptually showing the structure of the electric lifting device according to the first embodiment. In FIG. 1, reference numeral 21 is a device main body installed in a high place on the ceiling 22 side of a gymnasium or the like. The main body 21 includes a drive unit 2
3 and the rope fixing part 24 are built in.

The drive unit 23 is formed by connecting a take-up drum 23b to a horizontal output shaft of a motor 23a with a speed reducer capable of rotating in the forward and reverse directions. The winding drum 23b is of a single drum type, that is, the winding portion of the wire rope 25 has a single winding drum. The rope fixing portion 24, which is a fixed stopper plate, is provided corresponding to the winding drum 23b.

One end of the wire rope 25 that is wound and unwound with respect to the winding drum 23b is fixed to the winding drum 23b, and the other end is fixed to a rope fixing portion 24 via a rope stopper 26. The rope 25 suspends an elevating body 28 that supports a lighting fixture 27 as a suspended object on the lower side. The suspension 28 has a power receiving contact (not shown), and this contact and the lighting fixture 27 are electrically connected.

Next, the suspension structure for the lifting body 28 will be described in detail. A pulley base 29 is built in the lifting body 28. The pulley base 29 has a trough structure having a U-shaped cross section with its upper surface and both ends in the longitudinal direction open, and a spindle 30 penetrating the center position in the longitudinal direction.
It is rotatably mounted in the lifting body 28 via.
The support shaft 30 is horizontally arranged, for example, at a substantially central position in the width direction of the lifting body 28 (left-right direction in FIG. 1). Therefore,
The pulley base 29 is rotatable about a support shaft 30 so as to perform a seesaw motion, so that both ends in the longitudinal direction are moved in opposite directions and are displaced in the vertical direction. Rotatable pulleys 31 and 32 are individually attached to both ends of the pulley base 29 in the longitudinal direction. These pulleys 31 and 32 are the pulley base 2
9. And the wire rope 25
U inside the lifting body 28 via the two pulleys 31 and 32.
It is passed through in a turn shape, whereby the lifting body 28 is suspended on the wire rope 25. As shown in FIG. 1, a pair of rope through holes 28a are formed in the upper wall of the lifting body 28.
(Only one shown) is opened and these through holes 28
The wire rope 25 is passed through a.

A positioning guide 33 is provided on the apparatus main body 21 so that the elevating body 28 is positioned at the elevated position on the ceiling side. Further, in order to prevent the load of the lighting fixture 27 from being applied to the wire rope 25 under this positioning, the lifting body 28
The structure that forms a lock mechanism (not shown) that mechanically supports the device main body 21 with respect to the device main body 21 includes the device main body 21 and the lifting body 28.
Are shared by both parties. Furthermore, the device body 2
A power supply contact which is elastically contacted with the power receiving contact (not shown) when the elevating body 27 is arranged in a raised position is provided in the inside of 1. Connection is made and thus the lifting body 28
The lighting fixture 27 can be energized via the.

In the single-winding type electric lifting device having such a structure, the motor 23a with a speed reducer of the drive unit 23 is normally rotated and the wire rope 25 is wound around the winding drum 23b, so that the lifting unit 28 is moved along with the lifting unit 28. The lighting fixture 27 can be raised to the raised position, and the motor 23a is rotated in the reverse direction to rewind and unwind the wire rope 25 from the winding drum 23b to lower the lighting fixture 27 together with the lifting body 28 to the lowered position. You can

At the elevated position on the ceiling side, the elevating body 28 is engaged with the positioning guide 33 to be properly positioned and mechanically supported by the apparatus main body 21 by a lock mechanism (not shown), and is not shown. The power supply contact and the power reception contact are in contact with each other and the lighting fixture 27
Since it is provided so that electricity can be supplied to the lighting device 27, the lighting device 27 can be turned on for use. In addition, the lighting fixture 27 that has been lowered together with the lifting body 28 to the lowered position on the floor surface undergoes maintenance work such as lamp replacement.

By the way, when the elevating body 28 is moved up and down as described above, the pulley base 29 provided for the seesaw movement about the support shaft 30 as the center moves up and down the wire rope 25.
2 is rotated around the support shaft 30 as shown in FIG.
As shown in (A), the pulley 31 on the drive unit 23 side is raised and the pulley 32 on the rope fixing unit 24 side is lowered so as to be inclined in the elevating body 28. On the contrary, when the elevating body 28 is lowered as the wire rope 25 is unwound, the pulley base 29 is rotated around the support shaft 30 and the driving portion 23 is rotated as shown in FIG. Side pulley 31 is lowered and the rope fixing portion 24 side pulley 32 is inclined in the lifting body 28 so as to rise.

The seesaw movement of the pulley base 29 associated with the lifting of the lifting body 28 does not affect the lifting body 28. Therefore, it is possible to prevent the elevating body 28 and the luminaire 27 from tilting as the wire rope 25 is wound and unwound, and to elevate the elevating body 28 together with the luminaire 27 while maintaining a certain posture.

In this way, the wire rope 25 passes through 2
Pulley base 29 to which individual pulleys 31 and 32 are attached
By the seesaw movement centering on the support shaft 30 of the vertical axis 28, the vertical movement of the vertical axis 28 and the lighting fixture 27 is suppressed while suppressing the inclination of the vertical axis 28.
Can be raised and lowered while being held in an appropriate posture, so that the behavior of the lighting fixture 27 and the like during the raising and lowering is stable, and the raising and lowering posture can be improved. Moreover, this prevents the positioning of the elevating body 28 from the positioning guide 33 when the elevating body 28 is placed in the raised position.
In contrast, the lifting body 28 can be properly arranged.

[0022]

The present invention is embodied in the form described above and has the following effects.

According to the first aspect of the present invention, when the wire rope is wound and unwound to raise and lower the lifting body, the pulley base on which the two pulleys through which the wire rope passes is attached is supported in the lifting body. Since the seesaw motion is performed around the axis,
The elevating body can be elevated and lowered while holding its proper posture while suppressing its inclination, and thereby the elevating body can be properly arranged with respect to the apparatus main body.

[Brief description of drawings]

FIG. 1 is a diagram conceptually showing the structure of an electric lifting device according to a first embodiment of the present invention.

FIG. 2A is a diagram showing an operation of a lifting body when winding the wire rope of the electric lifting device according to the first embodiment.
FIG. 6B is a diagram showing the operation of the lifting body when the wire rope is wound up in the electric lifting device according to the first embodiment.

FIG. 3 is a diagram conceptually showing the structure of an electric lifting device according to a conventional example.

FIG. 4A is a diagram showing an operation of a lifting body at the time of winding a wire rope in an electric lifting device according to a conventional example. (B) is a figure which shows operation | movement of the raising / lowering body at the time of winding the wire rope of the electric raising / lowering apparatus which concerns on a prior art example.

[Explanation of symbols]

 21 ... Device main body, 23 ... Driving part, 23b ... Winding drum, 24 ... Rope fixing part, 25 ... Wire rope, 27 ... Lighting fixture (suspended object), 28 ... Elevating body, 29 ... Pulley base, 30 ... Spindle , 31, 32 ... pulleys.

Claims (1)

[Claims] 1. A drive unit for winding and rewinding a wire rope is built in a device main body having a rope fixing portion and arranged at a high place, and the winding drum of the drive unit has a winding drum for the wire rope. One end is fixed and the other end of the wire rope is fixed to the rope fixing portion, and two rotatable pulleys incorporated in an elevating body supporting a suspended object are passed through the wire rope to form a U-turn shape. A lifting device for suspending the lifting body with this rope through the rope, and lifting and lowering the lifting body by winding and rewinding the wire rope, in which a pulley base is built in the lifting body and The center position is supported by a support shaft, the pulley base is provided for seesaw movement about the support shaft, and the pulleys are individually attached to both longitudinal ends of the pulley base. Lifting device.